Antiskid device



F. A. GREENFIELD. ANTISKID DEVICE. APPLICATION FILED APR) 9, 1921.

Patented Feb. 21, 1922.

3 SHEETS-SHEET 1- F. A. GREENFIELD.

ANTISKID DEVICE. APPLICATION mm APR, 9. 1921.

3 SHEETS-SHEET 2- egg, gl! gg .5

- Patented Feb. 21, 1922.

F. A. GRE ENFIELD. ANTISKID DEVICE. APPLICATION FILED'APIL 9, 1.921-

Patented Feb. 21, 1922.

3 SHEETS-SHEET 3.

ATTORNEY isomer).

Improvements in Antiskid Devices, of which FRANK A. GREENFIELD,

s'rATEs 0F PERRY, OKLAHOMA.

'ANTISKID DEVICE.

Application filed April 9,

To all whom cit-may concern:

Be it known that l, FRANK A. GREEN- FIELD, a citizen of the United States, residing at Perry in the county of Noble and State of Oklahoma, have invented new and useful the following is a specification.

This invention relates to non-skid shoes for vehicle tires and has for an object the provision of a sectional shoe which may be securedjto a tire for the purpose of preventing skidding and to provide increased tract on for the veh cle without reducing the re- SlllGllll qualities of the tire;

Another object of the invention is the provision of a shoe of the above character having a flexible connection between the sections, the character of this connection affording free movement between said sections without injury to the tire.

' 1 With the above and other objects in view,

the invention further includes the following novel features and details of construction, to be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claims. '-In the drawings Figure 1 is a side elevation of a wheel withthe invention applied thereto.

Figure 2 is an edge view of the same. Figure 3 is a transverse sectional view on an enlarged scale.

Figure 4 is an inside plan view of a number of the shoe sections.

Figure 5 is a central longitudinal sectional view through Figure 4.

-Figure 6 is a detail perspective view of one of the sections;

Figure 7 is a plan view showing a number of sectionshaving a different interlocking engagement.

Figure 8 is central longitudinal sectional view of the same.

Figure 9 is a detail perspective view of one .of the sections shown in Figures 7 and 8.

Figure 10 is a plan view of two sections 0f the shoe showing a further modified form of the device. V

Figure 11 1s a detail section similar to Figure 5, but illustrating the form of the invention shown in Figure 10.

Figure 12 is a detail perspective view of one of the shoe sections.

Figure 13 1s a transverse sectlonal view Specification of Letters Patent.

Patented Feb. 21,1922.

1921. Serial No. 460,106.

showing a portion of a tire with the inven tion applied. 1

Referring to the drawings in detail, wherein like characters of reference denote corresponding parts, the reference character 10 indicates a tire of pneumatic type, althoughof the drawings, the shoe is shown as comprising a number of separate sections 11, whichare designed to be arranged transversely of the tire and have their tread surfaces formed in a manner to prevent skidding. This may be accomplished in various ways, the sections 11 being shown as provided with spaced ribs 12 and 13. When the sections are assembled upon the wheel, the ribs 12 will extend circumferentially, while the ribs 13 will be disposed transversely of the tread, so that in addition to the prevention of skidding, the shoe will act to increase the traction qualities of the wheel and permit it to travel over snow or ice covered roads.

The opposite face of eachof the sections 11 is provided with a transverse seat so I formed that when the sections are assembled .there is provided a continuous groove 14 shaped to fit the tread of the tire. 'The cross tend transversely of-the said sections. Err-- tending outwardly from each of the sections beyond the flanges 15 are extensions 16,carrying upon their upper faces lugs or eyes 17. These lugs may be formed in various manners, either by being cast solidly with the sections, or by securing in each of the sections U-bolts or yokes 18, within which are gripped sleeves 19. These sleeves receive flexible members 20' herein shown in the form of chains. One of these chains is located upon each side of the tire, being threaded through the sleeves 19 of each section and having its ends provided with threaded bolts 1 21, the bolts at the opposite end of the chain having right and left hand threads. The bolts 21 are connected by means of a threaded sleeve 22, so that an annular flexible member is provided which serves to yieldingly hold the shoe sections upon the tire in a man- 5 in proper position upon the tread oi-"the tire, each of the sections is provided within the groove 14, with a socket'23. "Theses'ockets extend inwardly fromeach edge'of the sections, being divided by a central rib 24. Seated Within the sockets and extending from one section to the socket of the adjacentsection, are bars 25, the latterfhaving arelatively snug fit within the sockets, yet permitting .suflicient play between thesections The construction of the sockets and bars; is' suchfthat the outer face otthe bars j-is flush with the surface ofthe grooved-1,

so as not to injure the tire. J r i In the construction shown in-'Figures 7 zoiand- 8, the sections,;which are indicated at 26 are substantially the same as the shoe sections previously described. Thesections 26 Lare however,.notprovided with the sockets 2,3,"but an interlocking connection between these sections is" effected by forming the treadsurface of each section with a pair of spaced lugs 27 which project beyondone.

-e'dge thereof, while at the opposite edge there is provided a single lug- 28; -.This last solmentionedlug of one sectionvis adapted to be received between the spaced lugs 2710f the. next adjacent section, so that relative lateral movement between the sections is limited, at the same timefree radial movement is provided for. In addition, the shoe sections 26 areprovided with'eyes 29 which are formed integral with the sections and which receive flexible members 20. '7 1 Inthe formof the invention illustrated 40 in Figures 10 to 12 inclusive, each section is shown 'asformed with a laterally extendin'g projection 30 which extends fromf one side "off the section and isof concave-convex cross sectional shape. .This extension 30 is designed, to be. received with-in a concaved seat 31 formed in the sections, the j said seatextend-ing inwardly from one ,side edge of the section "to a pointadjacent the opposite side edge, so that it'extendsi or a major, portion of the Jwidth of the sec- '1ti0n.. -When the sections areajointed-Ito- 'getherfthe' inner faces of the extensions 30 are flush and provide an-annulargroove or g 7 formed at thelnner end of the seatland a seat for. the reception of the tread ofla tire.

V The sliocvis designed-for use with a tire of *suchidialneter that only the tread surface of the=tireengages the. annular groove or seat, so that the side :walls' of the. casing are permitted to' expand under increased pressure or shocksoro'fjars and the resiliencyiofthe tire is thus not impaired. Lo- 'catedi at eaeh end of each .of the sections is an. eye32, which-is preferably formed integral with the sections and extends upward V properly fall within the-scop'e'of the aplture, t

' from oile side edge and "is thus located adi jace'nt the j ointbetween the sections so that *a pull is- 'distribut'e'd throughout the surrounding section's. Due 'to the character the joint between thesections,-the latter "cannot tilt or tip as they engage the surface or the ground and as the joint is practically at the centerosf the sections, the freest'flexibility is at all times maintained.

It is preferredto 'form the tread surfaces-0f the 'shoe sections with non skid ribs, the ribs of the sections which are attached to the i'rontwheels extending trans- :verselyof the sections and 'circumferentiall of the wheel, whilethe ribs of the sections which are carried by the rearwheels preferably extend both transversely and longitudinally of the said sections and transversely and ,rcirciun ferentially of the wheel, as clearly illustratedinthe drawings.

- Thefinvention issusceptiblefofvarious changes in its form, proportions and minor details of construction andi' the right is hereiirreserved to 7 make such changes as pended claims. 1

Having described the V inventionwhat is claimed;is y

1. A non-skid shoelf'or vehicle tires-comprising a pluralityof separate sections,feach of saidjgsections fbeing arra-nged--,transversely of thetire and formed with a transversely disposed depression, which,'when the sections are assembled forms an annular V t re, rece ving groove, eyes carried at the outer ends of said sections, a flexible ele- ,ment threaded through the eyes, sockets lo- 7 fine aseat; which extends. from one edge of V the section to a point adjacent the "opposite edger a transversely, Jarranged shoulder tongue extending from the shoulder beyond the edge of the section, for engagement within tl'ieseat of the adjacent 'sectionandmeans whereby the sections may be secured in place upon the tire tO PIO Vi'ClQfZL' continuous tread. r

m r j In testimony whereof I afiix' my. signa- 125 FRANK newn ss 

